Weft inserting nozzle for looms



Feb. 23, 1960 L. TE STRAKE WEFT INSERTING NOZZLE FOR LOUIS Filed June 12, 1958 3 4 *A w gi I 5% WEFI INSERTING NOZZLE FOR LOOMS Lambertus te Strake, Deurne, Netherlands Application June 12, 1958, Serial No. 741,562

Claims. (Cl. 139--127) A loom having a shuttle that is thrown from side to side and that carries a bobbin from which a continuous weft thread is pulled 01f, wraps the weft thread over the outermost warp threads at each side of the strip of fabric being woven and thus forms a self-edge which is known in the art as a natural selvedge.

Because looms having shuttles are noisy and must be operated at relatively slow speeds, they have been largely superseded for quantity production by looms in which lengths of weft thread are inserted in sheds and blown across the warp threads by jets of air, or other fluids.

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tube is made somewhat pear-shaped in cross section and is chamfered at its ends so that the sections of the wall of the tube on each side of the slot are shortened and are nearly flat and substantially tangential to the rounded section of the wall of the tube that lies opposite to the slot.

The purpose, the structure and the mode of operation of a preferred form of weft inserting nozzle will be ap Looms in which weft threads are inserted by jets can be 1 plurality of traverses and wrapping the continuous weft thread over the outermost warp threads to form a natural selvedge at each side of a strip of fabric. It has been necessary heretofore to sever each traverse length so that a new end of the next length can be fed through the nozzle and into the shed.

Some mechanisms for tucking loose ends of lengths of weft thread back into the shed between outer strands of warp threads have been devised, but strips of fabric woven on looms incorporating such mechanisms have thick edges which are liable to ravel and which interfere with subsequent treatment of the fabric such as pressing it smooth by passing it between rollers.

It is an object of this invention to provide a nozzle which is capable of inserting a plurality of lengths of weft thread into and through a shed and across warp threads forming said shed, said lengths of weft thread being connected by bights which are wrapped over the outermost warp threads to constitute natural selvedges.

The above-mentioned object is accomplished by means of a special construction of the weft inserting nozzle which according to this invention comprises a jet nipple and an injector tube extending beyond the tip of the said jet nipple, the said injector tube having an opening for secondary air to be entrained by a high-speed jet emerging from the jet nipple, through which opening a weft thread may pass into the injector tube, said tube having an open end from which the fluid of the jet, the entrained air and the weft thread emerge whereby the weft thread is blown across warp threads with which it is to be woven into fabric, the said opening being connected to the said open end of said injector tube by a slot through which such weft thread can be translated out of the tube whereby a second length of the weft thread while still integral with the first length thereof can be severed from a supply cone and the severed end of such second length can pass through the said opening and through the said injector tube thereby forming a loop in such second length of the weft thread which loop moves along the weft thread and through the said slot.

To facilitate and guide the movements of the weft thread into, through and out of the injector tube the parent from a perusal of the following description of a preferred form of the invention as illustrated by the accompanying drawings in which:

Fig. 1 is a plan view, partly in section, of a weft inserting nozzle incorporating the instant invention.

Fig. 2 is a side-view of the weft inserting nozzle.

These drawings and the description that follows illustrate and describe a preferred embodiment of the instant invention but they are not intended to impose limitations upon its scope.

The nozzle consists of a jet nipple 1 which is connected to a pressure-line, an injector tube 2 secured to said jet nipple and surrounding the tip thereof.

The injector tube is provided with a slot 3 having such a width that a thread can be pulled through this slot. The slot is positioned opposite the wall 5 of the injector tube which has a normal cylindrical shape.

Converging flattened surfaces 4, extending tangentially from cylindrical wall section, space the slot 3 further from the central axis of the nozzle than the wall 5 is spaced from this axis.

The edges 7 of the flattened surfaces 4 enclose an opening which acts as a suction opening. According to the injector-principle secondary air is drawn in through this opening. Owing to the suction action of this indrawn secondary air, a weft thread can be introduced into the nozzle through the opening defined by the edges 7.

The discharge end 6 of the injector tube is chamfered, so that the length of the cylindrical section of the wall 5 is greater than the length of the flattened surfaces 4 of the wall. By these arrangements the injector action of the weft inserting nozzle is not impaired and the jet leaving the jet nipple 1 is accurately orientated.

The edges 7 should lie behind the tip 8 of the jet nipple. After a weft-thread has been blown into the shed and the shed has been closed, the part extending out of the shed is pulled sidewise out of the tube through the slot 3.

The part of the weft thread extending out of the shed is so long that it is sufiicient to form a new length of weft-thread which is severed from the supply cone, and the severed end of this new length of weft thread is brought to the nozzle at the place opening for the ingress of secondary air by mechanical means, in order to be blown into the shed while still integrally connected to the length of weft thread previously blown into the shed.

The foregoing description and the accompanying drawings illustrate and describe a preferred form of the instant invention but it is to be understood that the invention encompasses modifications within the spirit and scope of the subjoined claims.

I claim:

1. A weft inserting nozzle which comprises a jet nipple and an injector tube extending beyond the tip of the said jet nipple, the said injector tube having an opening for secondary air to be entrained by a high-speed jet emerging from the jet nipple, through which opening a weft thread may pass into the injector tube, said tube having an open end from which the fluid of the jet, the entrained air and the weft thread emerge whereby the weft thread is blown across warp threads with which it is to be woven into fabric, the said opening being connected to the said open end of said injector tube by a slot through which said weft thread can be translated out of the tube, whereby a second length of the weft thread while 'still integral with the firstlength thereof can be severed from a supply cone and-the severed end of such second length can pass through the said opening and through the said injector tube thereby forming a loop in such second length of the weft thread which loop can move along the weft 'threadand through the said slot.

2. A weft inserting nozzle which comprisesa' jet nipple and an injector tube extending beyond the tip of-the said jet nipple, the said injector tube having an opening for secondary air to be entrained by 'a high-speed jet emerging from the jet nipple, through which opening a weft thread may pass into the injector tube,said tube having an open end from which the fiuidof 'the'jet, the entrained air and the'weft thread emerge whereby the Weft thread is blown across wa'rp-threads'with which it is to be woven into fabric, the said opening being c'on nected to the'said open end of said injector tubeby a slot through which "such weft thread can be translated out of the tube, whereby a second length of the weft thread while still integral with the first length thereof can be severed from a supply cone and-the severed end of such second length can pass through the said opening and through the -said injector tube thereby forming a loop in such second length of the weft thread which loop can move along the weftthread and through'thesaid slot, said injector tube being made somewhat pear-shaped in cross section and being chamfered at its ends so that the sections of the'wall of' the tube on each'side of the slot are shortened and are nearly flat and substantially tangential to'a roundedsection-of the wall of the tube that lies opposite to the'slot.

3. A weft inserting nozzle which'comprises a jet nipple and an 'injector tube extending beyond the tip of the saidjet nipple, the said injector tube having an opening 35 3 -5 for secondary ==air to be entrained by a high'speedfljet emerging from the jet nipple, through which opening a weft thread may pass into the injector tube, said tube having an open end from which the fluid of the jet, the entrained air and the weft thread emerge whereby the weft thread is blown across warp threads with which it is to be woven into fabric, the said opening being connected to the said open end of said injector tube by a slot through which such weft thread can be translated out of the tube, whereby a second length of the weft thread 'While still integral with the first length thereof can be severed fromasupply cone and thesevered end of such second length can pass through the said opening and through the said injector tube'thereby forming a loop in such second length of the weft thread which loop can move along the weft thread and through the said slot, said injector tube being made somewhat pearshaped in cross section so that the sections of the Wall of the tube on each side of the slot are nearly flat and substantially tangential to a rounded section ofthe wall of the tube that lies opposite to the slot.

4. A weft inserting nozzle according to claim 3 characterized in that the boundary of the said slot is spaced farther from the longitudinal axis of the injector tube passing through the jet nipple than is-the rounded section of the wall of the tube that lies opposite to the slot.

5. A weft inserting nozzle-according to claim 3- characterized in that the tip of the jet nipple extends beyond the opening for secondary air.

References Cited in the file of' this' patent UNITED STATES PATENTS Paabo 'Aug.'22, 1950 Dunham May 5, 1953 Svaty Feb. 6, 1954 

